[Patch, Fortran] PR fortran/37688: Relax "used before typed" check

[Daniel Kraft]

Hi,

as suggested by Tobias, this patch relaxes the "used before typed" check 
to allow code like this:

SUBROUTINE (n)
   INTEGER :: arr(n + 1)
   INTEGER :: n

which is strictly speaking invalid but used in real world code and poses 
no problem to implement.  At the moment, a slightly stricter variant is 
implemented in gfortran which allows only arr(n) (in -std=gnu) for 
not-yet-typed n, and this patch extends this permission for basic 
arithmetic expressions like the one above.

Regression test running on GNU/Linux-x86-32.  Ok for trunk if no 
regressions?

Yours,
Daniel

-- 
Done:  Arc-Bar-Cav-Rog-Sam-Val-Wiz
To go: Hea-Kni-Mon-Pri-Ran-Tou
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